Radio Communication System, Base Station Apparatus, and Control Information Transmission Method

1. A radio communication system comprising: a first base station apparatus, a second base station apparatus, and a third base station apparatus; a first application server, a second application server, and a third application server; and a terminal apparatus, wherein the first application server includes: a transceiver configured to transmit to and receive from the terminal apparatus individual data via the first base station apparatus, the first base station apparatus includes: a first controller configured to request from the second base station apparatus first control information regarding the second application server connected to the second base station apparatus and second control information for the terminal apparatus to connect to the second base station apparatus, and a transmitter configured to transmit to the terminal apparatus the second control information received from the second base station apparatus, at least, the second base station apparatus includes: a second controller configured to report the first and second control information to the first base station apparatus, the terminal apparatus includes: a receiver configured to receive at least the second control information from the first base station apparatus, wherein the first controller is configured to change a connection destination of the terminal apparatus from the second base station apparatus to the third base station apparatus based on the first control information, third control information regarding the first application server, and fourth control information regarding the third application server connected to the third base station apparatus.

2. The radio communication system according to claim 1 , wherein the first control information includes, at least one of: connection information of the second application server in the radio communication system, and information regarding to a route or transmission delay between the second base station apparatus and the second application server.

3. The radio communication system according to claim 1 , wherein the first controller is configured to previously or periodically collect the first control information.

4. The radio communication system according to claim 1 , wherein the first controller is configured to change a communication destination of the individual data from the first application server to the second application server, before changing the connection destination of the terminal apparatus.

5. The radio communication system according to claim 1 , wherein the second controller is configured to change a communication destination of the individual data from the second application server to the third application server based on the first control information, after the terminal apparatus completed connection to the second base station apparatus.

6. The radio communication system according to claim 1 , further comprising: a third controller configured to transmit to the second application server application state information including data amount or transmission time of the individual data transmitted from the first application server to the terminal apparatus.

7. The radio communication system according to claim 2 , wherein the connection information of the second application server in the radio communication system indicates position of the second application server.

8. The radio communication system according to claim 2 , wherein the information regarding to transmission delay indicates time until the terminal apparatus receives the individual data transmitted from the second application server.

9. The radio communication system according to claim 2 , wherein the first control information includes information regarding to a providable service to the terminal apparatus by the second application server.

10. The radio communication system according to claim 9 , wherein the information regarding to the providable service includes time until the terminal apparatus receives the service provided from the second application server.

11. The radio communication system according to claim 1 , wherein the first controller is configured to transmit a first message included in a request for the first control information to the second base station apparatus when the terminal apparatus is to change connection from the first base station apparatus to the second base station apparatus, and the second controller is configured to transmit a second message included in the first control information to the first base station apparatus when the terminal apparatus is to change connection from the first base station apparatus to the second base station apparatus.

12. The radio communication system according to claim 11 , wherein the first message is a Handover Request message, and the second message is a Hanover Request Acknowledgement message.

13. The radio communication system according to claim 11 , wherein the first controller is configured to insert the request for the first control information in a first information element transmitted in the request for the first control information, and transmits a Handover Request message included in the first information element to the second base station apparatus, and the second controller is configured to insert the first control information in a second information element transmitted in the first control information, and a Handover Request Acknowledgement message included in the second information element to the first base station apparatus.

14. The radio communication system according to claim 1 , wherein the first controller is configured to insert a request for the first control information in a Data Chunk area of SCTP (Stream Control Transmission Protocol) and transmit the request for the first control information, and the second controller is configured to insert the first control information in the Data Chunk area of the SCTP and transmit the first control information.

15. The radio communication system according to claim 1 , wherein the first controller is configured to insert a request for the first control information in a payload area of X2-AP (X2 Application Protocol) and transmit the request for the first control information, and the second controller is configured to insert the first control information in the payload area of the X2-AP and transmit the first control information.

16. The radio communication system according to claim 5 , wherein the second controller is configured to change the communication destination of the individual data from the second application server to the third application server based on the first control information, third control information regarding to the first application server, and fifth control information regarding a fourth application server connected to the second base station apparatus.

17. The radio communication system according to claim 6 , wherein the third controller is configured to acquire the data amount or the transmission time from RTCP (Real-time Transmission Control Protocol) information included in an RTP (Real-time Transport Protocol) packet received from another apparatus connected via a CDN (Content Delivery Network).

18. A base station apparatus connected to a first application server, the base station apparatus comprising: a controller configured to request from a second base station apparatus first control information regarding a second application server connected to the second base station apparatus and second control information for a terminal apparatus to connect the second base station apparatus; and a transmitter configured to transmit to the terminal apparatus the second control information received from the second base station apparatus, at least, wherein the controller is configured to change a connection destination of the terminal apparatus from the second base station apparatus to a third base station apparatus based on the first control information, third control information regarding the first application server, and fourth control information regarding a third application server connected to the third base station apparatus.

19. A base station apparatus connected to an application server, the base station apparatus comprising: a receiver configured to receive a request for first control information regarding the application server and second control information for a terminal apparatus to connect to the base station apparatus, transmitted from a second base station apparatus; and a controller configured to report the first and second control information to the second base station apparatus wherein the second base station is configured to change a connection destination of the terminal apparatus from the base station apparatus to a third base station apparatus based on the first control information, third control information regarding a second application server connected to the second base station, and fourth control information regarding a third application server connected to the third base station apparatus.

20. A control information transmission method in a radio communication system including a first base station apparatus, a second base station apparatus, a third base station apparatus, a first application server, a second application server, a third application server, and a terminal apparatus, the method comprising: transmitting to and receiving from the terminal apparatus individual data via the first base station apparatus by the first application server; requesting from the second base station apparatus first control information regarding the second application server connected to the second base station apparatus and second control information for the terminal apparatus to connect to the second base station apparatus, by the first base station apparatus; transmitting to the terminal apparatus the second control information received from the second base station apparatus, at least, by the first base station apparatus; reporting the first and second control information to the first base station apparatus, by the second base station apparatus; receiving the second control information from the first base station apparatus at least, by the terminal apparatus; and changing a connection destination of the terminal apparatus from the second base station apparatus to the third base station apparatus based on the first control information, third control information regarding the first application server, and fourth control information regarding the third application server connected to the third base station apparatus.